Mole Ratios That Are Fractions

How do you know what number to multiply your ratios by to get whole number ratios.

You want: C₃H₈
But the your empirical formula is CH_2.65
Here is a handy table for converting decimal radicals to whole numbers

radical (number after the decimal	common fractions	factor to multiply by to get whole number ratio
0.1	1/10	10
0.125	1/8	8
0.143	1/7	7
0.16667	1/6	6
0.2	1/5	5
0.25	1/4	4
0.286	2/7	7
0.333	1/3	3
0.4	2/5	5
0.428	3/7	7
0.5	1/2	2
0.571	5/7	7
0.6	3/5	5
0.625	5/8	8
0.66	2/3	3
0.75	3/4	4
0.8	4/5	5
0.833	5/6	6
0.857	6/7	7
0.9	9/10	10

For 2.65, multiply by 3 = 7.95 = 8
C₃H₈